Fourths to heilner



L (No Model.)

P. KERN.

BOBBIN RETAINING DEVICE FOR SEWING MACHINES. v No. 436,002. PatentedSept. 9,1890.

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UNITED STATES PATENT OEFIcE.

FERDINAND KERN, OF NEWVARK, NEWV JERSEY, ASS IGNOR OF THREE- FOURTHS TOHEILNER 8: STRAUSS, OF NEW YORK, N. Y.

BOBBlN-RETAINING DEVICE FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent o. 4ee,oo 2, datedSeptember 9, 1890. Application filed November 9,1889. Serial No.329,728. (No model.)

- held in place in a sewing machine of the rotary-shuttle class.

Figure 1 is a face View of the shuttle and.

the stationary head. within which it revolves, the bobbin andbobbin-case being removed. Fig. 2 is a view of the same with the bobbinand bobbin-case in position. Fig. 3 is a side View of the same. Fig. 4is a longitudinal section of the same. Fig. 5 is a-plan view of thesame. Fig. 6 is an isometric view of the bobbin-case detached.

a. is the shaft, upon the end of which is mounted that portionof thestitch-forming mechanism which is below the table of the sewing-machine.This revolves within the stationary head b fixed beneath the table. Thisstitch-formin g mechanism is held within the stationary head I) by meansof a faceplate 0 screwed onto the face of the stationary head 6.

In the space at within the shuttle, Fig. 1, centered by the hollowspindle e,which is fixed upon a shuttle and coincides with the center ofrotation, is placed the bobbin f. This bobbin is inclosed within abobbin-case g, which has a spindle h extending inversely to the spindlee and fitting within the same. By this construction the bobbin isenabled to turn with respect to both the shuttle and the bobbin-case,while the shuttle is enabled to turn as the bobbin-case remainsstatidnary.

In order to provide for holding the bobbincase in position to preventits turning in operation, it is provided with an upwardly-projectingnose i, which overlaps the recess in the stationary head provided forthe descent of the needle. Upon the exterior of this nose is located thetension-spring It. All of the parts up to this point are old and wellknown, and a more detailed description of them is therefore unnecessary.

The novel part consists in the means by which the case g, containing thebobbin is held from falling out of the shuttle.

in position for operation, so as to be readily removable, when desired,in the direction of the arrow, Fig. 4, it being noticed that thus far inthe description no device has been mentioned which would prevent thebobbin-case To prevent this and at the same time permit the easy removalof the bobbin-case, I provide the spring Z, which is secured at one endto the faceplate c at one side, and extends horizontally across outsideof the nose 2' when the latter is in a vertical position. This springZis so adjusted that when the parts are in position for sewing theportion m, which is directly outside of the nose 11, does not press uponthe same, but provides sufficient clearance, as shown in Figs. 4 and 5.The clearance thus provided prevents the presence of the springZfrominterfering with the proper operation of the other parts. To oneside of the portion m the springZ is provided with an indentation at,which extends inward toward the face-plate so far as to prevent thepassage of the nose t' behind it without raising the springZ. When theparts are in position for sewing, the nose t' rests against one end 0 ofthe face-plate, which extends far enough out toward the spring Z toprevent the passage of the nose i between the two. Now it will beapparent that the nose 11 will be prevented from rotating with thestitching mechanism in one direction by the end 0 of the face-plate andin the other direction by the indentation n of the spring Z. It willlikewise be held from falling out of the shuttle by the spring portionm. It still remains, however, to provide for the removal of the bobbinand bobbincase g. This is done by cutting the spring Z away at the pointp, so that by raising the spring and permittlng the nose '5 to passunder the depression n: it will find at the cutaway portion 19 a freepassage for it out of the shuttle in the direction of the arrow, Fig. 4.The cut-away portion 19 is sufiiciently distant from the spindle 6 sothat the spring Z will not overlap the nose at that point.

In practice it will not be necessary to actually raise the spring Z,since the depression n forms an incline on both sides, which willcause'the spring to raise when the nose is pushed around in eitherdirection against the indentation n. Thus to remove the bobbin theoperator need merely press the bobbinoase around in the direction of thearrow, Fig. 2, until the nose comes opposite the opening 19, and thenremove it. The bobbin will come away with it. After changing the bobbinthe operator merely reverses this movement to insert it again. The end 0of the face-plate lies so flat against the head I) that theforwardinclination of the nose causes the two to clear each other as thebobbin-case is removed.

I claim-- 1. In a rotaryshuttle machine, in combination, the bobbin, thebobbin-case provided with a nose, a face-plate provided with an openingin which the nose projects, and the stationary spring overlapping saidnose and provided with a projection under which the nose is obliged topass in removing the bobbin-case, substantially as set forth.

2. In a rotary-shuttle machine, in combination, the shuttle, the bobbin,the bobbin-case provided with an upwardly-extending nose, the face-plateprovided with an opening to receive said nose and with an outwardprojection 0 at one side of said opening,whereby the bobbin-case isprevented from rotating in that direction, and a spring overlapping saidopening and provided on the opposite side thereof to the projection 0with an inward projection, whereby the bobbin-case is arrested fromoperation in that direction, substantially as described.

FERDINAND KERN. Witnesses:

MICHAEL T. BARRETT, LEON Warn.

